You have Nokia X2-01 mobile phones and you have airtel sim, you wanted access internet in Nokia X2-01 mobile but you can't access internet so I am suggest APN setting for Nokia X2 phones This is very simple.

Follow some steps for manual Apn airtel setting

1.First Go to Setting/ Cellular setting / Access point names.

2.Open Menu and select New APN option.

Make this manual setting in APN setting -

1.Enter name:-Airtel Internet

2.APN:-airtelgprs.com

3.Proxy:-202.56.231.117

4.Port:-8080

5.UserName:-

6.Password:-

APN type:-default

And more Proxy and function not fill Then save setting after saving setting you can easily access internet setting in Nokia X2 mobile.

Disclaimer:-This steps use any people can access internet in nokia X2 series mobile .